DE8132666U1 - Insert for an explosive charge for forming a substantially rod-shaped projectile - Google Patents

Description

RHEINMETALL GMBH Düsseldorf, 21.12.1983

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Reference number: G 81 32 666.1

Insert for an explosive charge for forming a substantially rod-shaped projectile from the insert

The invention relates to an insert according to the preamble of claim 1.

In the case of projectile-forming inserts, a distinction must be made between those in which a projectile is formed from the insert during a detonative conversion and those in which the projectiles, for example rods arranged in a meandering shape and welded together at their ends - are already predefined in the insert. An essential feature of explosive charges provided with such inserts is that the target effectiveness of a formed projectile is guaranteed over a considerably greater distance between the target and the detonation site than corresponds to the usual effective distance of a pointed cone shaped charge. While the rods specified in the insert move transversely to their respective longitudinal axes towards the target, the longitudinal axis of the projectile formed from the detonative conversion lies essentially in its direction of movement. In the latter case, both a flight-favorable and target-effective behavior is achieved.

nis of the project! Hang 1 to the projecti !.diameter d aimed for .

In view of the aforementioned large distance, the trajectory stabilization of such a projectile is of particular importance, since its target effectiveness - particularly aimed at penetration - depends essentially on the - preferably large - 1/d ratio
largely exploited when hitting the target

XO. The projectiles are therefore also rod-shaped. X-ray flash images during tests showed that such a projectile oscillates on its trajectory with a desirable 1/d ratio and
Consequently, there is a risk that when the projectile hits the target, it will form an undesirably large angle with the trajectory.

The invention is based on the object of providing an insert
of the type mentioned above, from which a rod-shaped and aerodynamically stable projectile is formed during the detonation.

This task is solved by the
The invention is set out in claim 1 and is explained in more detail below with reference to two preferred embodiments shown in the drawing.

It shows, in section along an axis of action or flight path and shown schematically next to each other, an explosive charge with insert in its initial state, a projectile formed from the insert on its flight path and finally when it hits a target, namely:

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Fig. 1: an arrangement in which the projectile oscillates and

Fig. 2

and 3: a first and a second arrangement according to the invention.

According to Fig. 1, an explosive charge 10 in the explosive has a front recess (not specified in more detail) with a rotationally symmetrical spherical insert 12.0, for example made of copper, iron or another suitable material, the rear side 11 of which faces the explosive 14 and the front side 17 of which faces a target 38. During the detonation conversion which takes place in a known manner, a rod-shaped projectile 20.0 is formed from the insert 12.0, which moves on a trajectory 18 towards the target 38. The projectile 20.0 has: a front part 22, a rear part 24.0, a length 30, a diameter 32 and a peripheral surface 37. A projectile longitudinal axis A encloses an oscillation angle 30 with the trajectory 18. A projectile centre of gravity 26 which is essentially at the front is separated by only a small distance 34 from an air attack point 28 which is essentially at the rear; this explains the tendency of the projectile 20.0 to oscillate, whereby an increase in the oscillation angle from 36 to 42 is frequently observed. The disadvantage of this is that at an angle 40 between the flight path 18 and the track of the target plate 38 in the plane of the drawing, the projectile 20.0

OQ in the area of an impact point 44 (end point of the theoretical flight path on the target plate 38) with its peripheral surface 37 hits the target plate 38. An original

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The actual ratio 1/d =■ 5 of the projectile 20.0 can, in the worst case, be reduced to the completely inadequate value of 0.2 in the target 38. This has a significant impact on the effectiveness of the target aimed at penetration.

According to Fig. 2, an insert 12.1 has a coating 13.1 made of a material in the central area of its rear side II, the density of which is greater than that of the material of the insert 12.1. The front side 17 is provided with a circular coating 15.1, the material of which has a lower density than that of the insert 12.1. In this way, the insert 12.1 forms a carrier for the coatings 13.1 and 15.1. During the detonation with the known deformation of the insert 12.1, the coating 13.1 in the front part 22 of a projectile 20.1 is enclosed by the material of the insert 12.1, while the material of the coating 15.1 - corresponding to its original arrangement in the base area of the insert 12.1 - can be seen on the outside in the rear part 24.1 of the projectile 20.1. As a result of the mentioned density difference and the distribution of the three materials involved in the different areas of the projectile 20.1, a larger axial distance 34 results between the projectile mass center of gravity 26, which is now shifted forward, and the air attack point 28, which is shifted back (each in comparison with the projectile 20.0 according to Fig. 1).

This results in an aerodynamically stable behavior of the projectile 20.1 on its trajectory 18 and an impact on the target while largely utilizing the original 1/d ratio aimed at penetration.

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Advantageously, the material of the coating 15.1 is arranged in the peripheral area with an increase in diameter at the rear, so that the affected rear part 24.1 acts as a drag stabilizer. 5

According to Fig. 3, a coating 13.2 of a comparatively denser material is arranged in the central area on the front side 17 of an insert 12.2 and a circular ring-shaped coating 15.2 of a comparatively less dense material is arranged on the back side 11 of the insert 12.2.

After the detonation of the insert 12.2 into a projectile 20.2, the material of the coating 13.2 can again be seen in the area of the front part 22, but this time as a tip-side covering, and the material of the coating 15.2 can be seen in the area of a rear part 24.2, but this time as an expanding inner lining. This arrangement also results in the favorable conditions described in connection with the embodiment according to Fig. 2.

Examples of materials that can be used for the carrier (insert 20.1, 20.2) are iron, copper and nickel. Examples of materials that can be used for the coating 13.1, 13.2 are tungsten, molybdenum, tantalum and depleted uranium.

For example, aluminum, magnesium, titanium and zirconium can be used for coating 15.1, 15.2. By using depleted uranium, titanium and zirconium, an additional pyropnore effect can be achieved in addition to the one already mentioned.

Claims (6)

Protection claims 1. Insert for an explosive charge for forming a substantially rod-shaped projectile from the insert, characterized in that the insert (12.1; 12.2) is made of iron or copper or nickel and has a coating (13.1; 13.2) of tungsten or molybdenum or tantalum or depleted uranium in its central region. 2. Insert according to claim 1, characterized by the arrangement of the coating (13.1) on the front side (17) of the insert (12.1). 3. Insert according to claim 1 or 2, characterized by the arrangement of the coating (13.2) on the back (11) of the insert (12.2). 4. Insert according to claim 1, 2 or 3, characterized by a circular ring-shaped coating (15.1; 15.2) made of aluminium or magnesium or titanium or zirconium. 5. Insert according to claim 4, characterized by front-side arrangement of the coating (&Igr;&dgr;.1). 6. Insert according to claim 4 or 5, characterized by rear-side arrangement of the coating (15.2;.